Earlier this week, The Free Thought Projectreported that Pink Floyd frontman Roger Waters stopped a concert in Barcelona to warn the crowd about pro-war propaganda that is coming from a group in Syria known as the White Helmets.

In the days since Waters has taken several interviews to further explain his views, the most interesting of which was with a group called the Grayzone Project, where exclusive Emails were featured, showing conversations between Waters’ team and representatives of the White Helmets.

Waters’ first encounter with the White Helmets was actually long before his April 13 concert, back in October 2016 when Saudi-British billionaire Hani Farsi invited him to a lavish fundraiser that he was holding on behalf of the White Helmet affiliated group “The Syria Campaign.”

The Syria Campaign is a subsidiary of the New York-based PR agency, Purpose, which claims to be impartial in the Syrian civil war. But as Alternet reported, they are on a mission to provoke western intervention in the region and have even openly called for a no-fly zone. The Syria Campaign works very closely with the White Helmets and likely has many of the same members.

Last year, the Syria Campaign paid actors up to $600 each to participate in a pro-White Helmet flash mob and orchestral performance at New York City’s Grand Central Station.